To get TM Dream Eater in White 2/Black 2, first travel or fly to Striaton City. In B/W 2 you may or may not have to beat the Elite 4 and/or obtain the National Dex. Anyway, after you're in Striaton, head east past the Cafe and north into the Dreamyard. You will need a Pokémon with HM01 Cut. Cut the tree down. Navigate to the tall grass and head east. You will end up on the otter side of the wall and see a Pokéball. That is TM85 Dream Eater. (Note: If this is your first time in the Dreamyard, you will encounter Latios (B2) or Latias (W2). Hope this helped. :D
